Yes, Yes, and yes!

MH370 was lost due to no signal. However, a special satellite picked up a weak signal of MH370. It shows that MH370 turn slightly off it's flight path, probably due to Hijacktion, which is most common because two of the passengers entered the plane with a stolen passport, or pilot suicide. If MH370 was equipped with a special tracking equipment, air crash investigators could have easily tracked MH370, and could have sent some F-16's to track the aircraft. Then, by now, everybody would know the world's most common question; How did MH370 vanish? But by know, there is only a flapperon found.